Cisco Mobility Express on Extreme Switch

Has anyone use Cisco Mobility Express on an Extreme Switch environment.. i have manage to setup Mobility Express (WLC) Software using Cisco 1850 Access Points and everything works ok on a test environment using a Cisco 2960 Switch; then i change the switch for an extreme summit 440x and the function of WLC redundancy stops working. (using the switch with factory default configuration).

I also try to test in our extreme switch production environment, and redundancy (WLC) doesn't work either.

It's like the protocol VRRP using Cisco switch works.. but as soon i test in my extreme switches environment.. the protocol doesn't broadcast/work..